The content on this page is being archived for historic and reference purposes only. The content, links, and pdfs are no longer maintained and might be outdated.

West Nile Virus Activity --- United States, 2005

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 3
a.m. Mountain Daylight Time, August 9, 2005.

Twenty-two states (Arizona, Arkansas, California, Colorado, Florida, Georgia, Illinois, Indiana, Kansas,
Louisiana, Minnesota, Mississippi, Missouri, Nevada, New Mexico, New York, North Carolina, North Dakota, Ohio,
Pennsylvania, South Dakota, and Texas) have reported 187 cases of human WNV illness in 2005 (Figure and
Table). Ninety-eight (57%) of the 171 cases for which such data were available occurred in males; the median age of patients was 47 years (range:
4--85 years). Date of illness onset ranged from May 14 to August 4; three cases were fatal.

Fifty-four presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET during 2005. Of these, 25 were reported from California, 18 from Texas, five from South Dakota, three from Arizona, and one each from
Iowa, Louisiana, and Mississippi. Of the 54 PVDs, 11 persons (median age: 50 years [range: 17--77 years]) subsequently had West Nile fever.

In addition, 1,162 dead corvids and 248 other dead birds with WNV infection have been reported from 32 states.
WNV infections have been reported in horses from 21 states (Alabama, Arizona, California, Colorado, Idaho, Illinois, Kansas, Kentucky, Minnesota, Mississippi, Missouri, Nebraska,
Nevada, New Mexico, North Dakota, Ohio, Oklahoma,
South Dakota, Texas, Vermont, and Wyoming), one dog from
Nebraska, and one squirrel from Arizona. WNV seroconversions
have been reported in 126 sentinel chicken flocks from nine states (Arizona, Arkansas, California, Florida, Iowa, Louisiana, North Dakota, New Mexico, and Utah). One seropositive sentinel horse was reported from Minnesota. A total of 2,493 WNV-positive mosquito pools have been reported from 27 states (Alabama, Arizona, Arkansas, California, Colorado,
Connecticut, Georgia, Idaho, Illinois, Indiana, Kansas, Louisiana, Massachusetts, Michigan, Minnesota, Missouri, Nebraska, Nevada, New Jersey, New Mexico, Ohio, Pennsylvania, South Dakota, Tennessee, Texas, Utah, and Virginia).

Use of trade names and commercial sources is for identification only and does not imply endorsement by the U.S. Department of
Health and Human Services.References to non-CDC sites on the Internet are
provided as a service to MMWR readers and do not constitute or imply
endorsement of these organizations or their programs by CDC or the U.S.
Department of Health and Human Services. CDC is not responsible for the content
of pages found at these sites. URL addresses listed in MMWR were current as of
the date of publication.

DisclaimerAll MMWR HTML versions of articles are electronic conversions from ASCII text
into HTML. This conversion may have resulted in character translation or format errors in the HTML version.
Users should not rely on this HTML document, but are referred to the electronic PDF version and/or
the original MMWR paper copy for the official text, figures, and tables.
An original paper copy of this issue can be obtained from the Superintendent of Documents,
U.S. Government Printing Office (GPO), Washington, DC 20402-9371; telephone: (202) 512-1800.
Contact GPO for current prices.

**Questions or messages regarding errors in formatting should be addressed to
mmwrq@cdc.gov.